Measurement of the matrix elements for the decays eta -> pi(+)pi(-)pi(0) and eta/eta ' -> pi(0)pi(0)pi(0)

BESIII Collaboration

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Abstract

Based on a sample of 1.31 x 10(9) J/psi events collected with the BESIII detector at the BEPCII collider, Dalitz plot analyses of selected 79,625 eta -> pi(+)pi(-)pi(0) events, 33,908 eta -> pi(0)pi(0)pi(0) events, and 1,888 eta' -> pi(0)pi(0)pi(0) events are performed. The measured matrix elements of eta -> pi(+)pi(-)pi(0) are in reasonable agreement with previous measurements. The Dalitz plot slope parameters of eta -> pi(0)pi(0)pi(0) and eta' -> pi(0)pi(0)pi(0) are determined to be -0.055 +/- 0.014 +/- 0.004 and -0.640 +/- 0.046 +/- 0.047, respectively, where the first uncertainties are statistical and the second systematic. Both values are consistent with previous measurements, while the precision of the latter one is improved by a factor of 3. Final state interactions are found to have an important role in those decays.
Original languageEnglish
Article number012014
Number of pages11
JournalPhysical Review D
Volume92
Issue number1
DOIs
Publication statusPublished - 31-Jul-2015

Keywords

  • DETECTOR
  • 3PI
  • ELECTROMAGNETIC CORRECTIONS
  • GAMS-4-PI SPECTROMETER
  • PARAMETER ALPHA
  • NEUTRAL DECAYS
  • PI 0
  • 3-PI(0)
  • DYNAMICS

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